linux-kernel - Re: [PATCH] hw breakpoint: Fix possible memory leak

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Date:	Mon, 27 Feb 2012 12:04:54 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Namhyung Kim <namhyung.kim@....com>,
	Namhyung Kim <namhyung@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH] hw breakpoint: Fix possible memory leak

On Mon, 2012-02-27 at 11:44 +0100, Ingo Molnar wrote:
> I edited that code earlier today - is the form below OK, or can 
> you see a simpler method? It's not yet pushed out so can still 
> edit it. 

I think something like the below should do, but then I didn't really
think much about it, my thoughts went like:

... *shees* that's ugly
  ... that error path already does a loop
    ... what the problem is!? -- reread changelog
      ... err_cpu == cpu is placed wrong!


So I replied and marked read.. waiting to either hear if there's a good
reason to do ugly or find a new (tested) patch in my inbox.. :-)

---
 kernel/events/hw_breakpoint.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/events/hw_breakpoint.c b/kernel/events/hw_breakpoint.c
index b0309f7..3330022 100644
--- a/kernel/events/hw_breakpoint.c
+++ b/kernel/events/hw_breakpoint.c
@@ -658,10 +658,10 @@ int __init init_hw_breakpoint(void)
 
  err_alloc:
 	for_each_possible_cpu(err_cpu) {
-		if (err_cpu == cpu)
-			break;
 		for (i = 0; i < TYPE_MAX; i++)
 			kfree(per_cpu(nr_task_bp_pinned[i], cpu));
+		if (err_cpu == cpu)
+			break;
 	}
 
 	return -ENOMEM;

--
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